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1519055 
Journal Article 
XANES evidence of arsenate removal from water with magnetic ferrite 
Tu, Y-J; You, C-F; Chang, C-K; Wang, S-L 
In Press 
Yes 
Journal of Environmental Management
ISSN: 0301-4797
EISSN: 1095-8630 
120 
114-119 
English 
Arsenic (As) in groundwater and surface water is a worldwide problem possessing a serious threat to public health. In this study, a magnetic ferrite, was synthesized and investigated for its As(V) removal efficiency. The adsorption of As(V) by magnetic ferrite exhibited an L-shaped nonlinear isotherm, suggesting limiting binding sites on the adsorbent surface. The As K-edge X-Ray Absorption Near-Edge Structure (XANES) revealed that the adsorbed As(V) on ferrite was not reduced to more toxic As(III) by Fe(2+) in the ferrite structure. The maximum As adsorption capacity of ferrite was 14 mg/g at pH 3 and decreased with increasing pH due to enhanced electrostatic repulsion between As(V) and the adsorbent surface. Desorption of As(V) using six different acid and salt solutions showed that the desorption rate decreased in an order of H3PO4 > Na3PO4 > H2SO4 > Na2SO4 > HCl > HNO3. These results suggest that magnetic ferrite without surface modification is an effective adsorbent for removing As(V) from water, which was confirmed by the effective removal of As(V) from contaminated groundwater using this material. The used material can then be recovered using a magnet because of its paramagnetism; the adsorbed As(V) on the material can be recovered using H3PO4 or Na3PO4 solutions. 
Adsorption; Arsenate; Contaminated groundwater; Magnetic ferrite; As K-edge XANES 
IRIS
• Arsenic Hazard ID
          ToxNet
          Considered New
          PubMed
          Considered New
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          WOS
          ToxNet
          Excluded
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          Excluded
               Toxnet Duplicates
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          Excluded
               Toxnet Duplicates
          ToxNet
          Excluded
               Toxnet Duplicates
          ToxNet
          Excluded
               Toxnet Duplicates
          ToxNet
          Excluded
               Toxnet Duplicates
          ToxNet
          Excluded
               Toxnet Duplicates
     2. Lit Search Updates through Oct 2015
          PubMed
          WOS
          ToxNet
          Considered
     7. Other Studies through Oct 2015
          Other
• Arsenic (Inorganic)
     1. Literature
          Lit search updates through Oct 2015
     3. Hazard ID Screening
          Other potentially supporting studies